Daikin REYQ72TTJU Installation Manual

Daikin REYQ72TTJU Installation Manual Manual pdf 17 page image

143P362438-3H E nglish8 Precautions on refrigerant piping• Do not allow anything other than the designated refrigerant to getmixed into the refrigerant cycle, such as air, nitrogen, etc. If anyrefrigerant gas leaks while working on the unit, ventilate the roomthoroughly right away.• Use R410A only when adding refrigerant.• Installation tools:Make sure to use installation tools (gauge manifold, charge hose,etc.) that are exclusively used for R410A installations to withstandthe pressure and to prevent foreign materials (e.g., mineral oils andmoisture) from mixing into the system.• Vacuum pump:- Use a 2-stage vacuum pump with a non-return valve.- Make sure the pump oil does not flow oppositely into the systemwhile the pump is not working.- Use a vacuum pump which can evacuate to 500 microns.Protection against contamination when installing pipesTake measures to prevent foreign materials like moisture and contami-nation from mixing into the system.Installation Protection methodMore than a month Pinch the pipeLess than a monthPinch or tape pipeRegardless of the periodBlock all gaps in the holes for passing out piping and wiring using seal-ing material (field supply) (the capacity of the unit will drop and smallanimals may enter the machine).Example: passing piping out through the front.11 Close the areas marked with .(When the piping is routed from thefront panel.)• Use clean pipes only.• Hold the pipe end downwards when removing burrs.• Cover the pipe end when inserting it through a wall so that no dustor dirt enters the pipe.NOTE• After all the piping has been connected, make sure there is no gasleak. Use Dry Nitrogen to perform a gas leak detection.• After knocking out the holes, we recommend you remove burrs inthe knock holes and paint the edges and areas around the edgesusing the repair paint.8 1 Caution for brazing• Make sure to blow through with Dry Nitrogen when brazing. Blowingthrough with Dry Nitrogen prevents the creation of large quantitiesof oxidized film on the inside of the piping. An oxidized film ad-versely affects valves and compressors in the refrigerating systemand prevents proper operation.• The Dry Nitrogen pressure should be set to 2.9 psi (0.02 MPa (i.e.,just enough so it can be felt on the skin)) with a pressure-reducingvalve.1 2 3 4 5661 Refrigerant piping2 Part to be brazed3 Taping4 Hands valve5 Pressure-reducing valve6 Dry NitrogenDo not use anti-oxidants when brazing the pipe joints. Residue canclog pipes and break equipment:• Do not use flux when brazing copper-to-copper refrigerant piping.Use phosphor copper brazing filler alloy (BCuP) which does notrequire flux.• Flux has an extremely harmful influence on refrigerant pipingsystems. For instance, if chlorine based flux is used, it will causepipe corrosion or, in particular, if the flux contains fluorine, it willdeteriorate the refrigerant oil.8 2 Connecting the refrigerant piping8 2 1 Decide front or side (bottom) connectionInstallation of refrigerant piping is possible as front connection or side con-nection (when taken out from the bottom) as shown in the figure below.1 231 Left-side connection2 Front connection3 Right-side connection• For side connections, the knockout hole on the bottom plate shouldbe removed:321141 Knockout hole (Piping)2 Drill3 Points for drilling4 Knockout hole (Power supplywiring)NOTEPrecautions when knocking out knockout holes:• Be sure to avoid damaging the casing.• After knocking out the knockout holes, we recommend you removethe burrs and paint the edges and areas around the edges usingrepair paint to prevent rusting.• When passing electrical wiring through the knock holes, protect the wir-ing with a conduit or bushings, making sure not to damage the wiring.8 2 2 Remove the pinched pipesWARNINGAny gas or oil remaining inside the stop valve may blow off the pinchedpiping.Failure to observe the instructions in procedure below properly mayresult in property damage or personal injury, which may be seriousdepending on the circumstances.